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Aiming at the inherent defect of single jammer against synthetic aperture radar (SAR) system with ground moving target indication (GMTI), this defect is usually solved by using the idea of dual-jammer cooperative jamming. However, the jamming methods of dual-jammer cooperative jamming in the current public literature need to reconnoitre some key parameters of SAR-GMTI system in advance, such as the carrier platform speed, the nearest slant distance between the jammer and the carrier platform, and the self-position of the two jammers. The acquisition of these parameters usually requires complex reconnaissance equipment. To solve this problem, an implementation method of dual-jammer system against SAR-GMTI based on integration of reconnaissance and jamming is proposed. This method uses the layout of jammers and receivers as well as the time difference of arrival (TDOA) information between receivers to effectively solve the problem of reconnaissance key parameters of complex equipment, and simplifies the configuration of jamming system. The results show that, considering the measurement error of TDOA and the spacing error of two antennas in SAR-GMTI system, the proposed method can also generate false moving targets with controllable velocity and azimuth position. Theoretical analysis and simulation results verify the feasibility of the proposed method. [ABSTRACT FROM AUTHOR]

In order to prevent the reconnaissance of synthetic aperture radar-ground moving target indication (SAR-GMTI) to moving targets on the ground, a smart jamming method of intermittent sampling based on noise multiplication modulation is proposed. Combining the intermittent sampling jamming with noise multiplication modulation, the jamming method can not only guarantee transceiver isolation, but also efficiently produce different effects of multiple target deception and dense target cover by the offline template design. The process performs intermittent sampling firstly, and then multiply product modulation with the designed template. The jamming signal model is established and the interference effect on SAR and SAR-GMTI is analyzed, the influence of reconnaissance error on performance is explained. The results show that the proposed method can make up for the defect of intermittent sampling effectively, whose distribution of false target is regular and distinguishable. The jamming scope is expanded and the jamming result is flexible. [ABSTRACT FROM AUTHOR]

The traditional synthetic aperture radar ground moving target indication (SAR-GMTI) deceptive jamming method based on dual synthetic jammers can generate very similar false moving targets. However, when the method is used to create a large number of false moving targets, the computational burden is very high, which does not meet the need for real-time jamming in electronic warfare. Therefore, we propose an algorithm for fast generation of dense false moving targets. This proposed method is based on the theory of dual jammers generating false stationary targets against dual-channel SAR-GMTI. By adding complex coefficient modulation to each jammer, the false targets can be detected as moving ones. In addition, by using an algorithm of SAR large scenes deception jamming, the computational burden is reduced when the jammer creates dense false moving targets which makes the proposed method applicable to engineering. Simulation experiments verify the effectiveness of the proposed method. [ABSTRACT FROM AUTHOR]

Considering the problem that the imaging position of synthetic aperture radar ground moving target indication (SAR-GMTI) of the traditional scattering-wave jamming is fixed, which makes the moving targets at specific position exposed, a compound scattering-wave jamming method based on two dimensional single tune modulation is proposed. According to the time-frequency coupling characteristics of linear frequency modulation signal, this method implements the frequency modulation of intercepted SAR signal in both range and azimuth profiles to control the jamming area, and the modulated jamming is amplified and projected to the metal scatterers. The analytical expression of the jamming imaging result against SAR-GMTI is deduced theoretically and the jamming performance is also analyzed in detail. The theoretical analysis and simulation results demonstrate that the proposed method can tackle the problem that the traditional scattering-wave jamming cannot cover the moving target at any position, and realize the flexible control of jamming imaging area by a fixed jammer and the jamming density by deployment of scatters. The SAR-GMTI can still be jammed even under large scouting error, which will provide some reference value for engineering application. [ABSTRACT FROM AUTHOR]

As an emerging imaging mechanism of synthetic aperture radar (SAR), the recently proposed multiple input multiple output SAR (MIMO-SAR) could obtain much more freedoms than the number of the physical antenna elements by utilizing waveform diversity and space diversity. As a result, it could overcome the limitation of the conventional SAR, and provide effective techniques for applications such as high resolution wide swath (HRWS) imaging, slow moving target detection, mean-time multi-mode operation and so on. This paper summarizes the research status of MIMO-SAR from domestic and abroad, analyzes its concept connotation, technical features and key technologies, and probes into its waveform designing techniques. Finally, combined with system development and practical applications, the developing trend of the MIMO-SAR imaging technique is discussed. [ABSTRACT FROM AUTHOR]